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Finding the Fourth Proportional to 400.79, 553.08 and 243.38

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Solution

The fourth proportional to 400.79, 553.08 and 243.38 is: 335.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.79 : 553.08 = 243.38 : x
  2. Step 2: Convert to fraction form
    400.79/553.08 = 243.38/x
  3. Step 3: Cross multiply
    400.79x = 553.08 × 243.38
  4. Step 4: Simplify right side
    400.79x = 134,609.99
  5. Step 5: Solve for x
    x = 134,609.99/400.79
  6. Step 6: Final answer
    x = 335.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.